光合作用和细胞呼吸是植物重要的代谢过程，受到多种因素的影响．据图回答以下的问题．图1中I、II表示光合作用的过程，1、9表示相关的细胞结构，2﹣8代表相关的物质．

（1）图1中I阶段表示光合作用的____ 阶段，其场所是____ ____ ，物质4、5分别代表____ 、____ ．

（2）图中6代表____ ，它的来源是____ ．

（3）在农作物种植中发现，种植密度过大会影响单株植物的光合作用产量或速率，影响I阶段主要环境因素是____ ，影响II阶段的主要环境因素是____ 

（4）图2表示环境条件适宜时某种植物叶片的光合速率与光照强度的关系，图中A点的数据必须在____ 条件下才能测得；C点表示____ ，此时植物叶肉细胞内产生ATP的场所是____ ．该植物叶片在光照强度为6Klx时的真正光合速率为____ （CO₂mg/100cm²/小时）．

   The sun, the moon and the stars(星星)are all in the sky. We see the moon and the stars at night. The sun is a ball. It's much bigger than the moon. It gives us heat(热量). The sun has a family. It's the biggest member of the family. The moon is a ball, too, like the sun and the earth. Sometimes it looks as round as a plate(盘子). Sometimes it looks half a plate. It looks bigger because it's much nearer to the earth. It's much smaller than the sun. It's smaller than the stars. The light on the moon comes from the sun. It has no light of its own.
   The stars look smaller than the sun. They look small because they are very far away from us. All day the stars are in the sky. But the light from the sun is too bright. We can't see the stars in the day.

以物理为基础的科学技术的高速发展，直接推动了人类社会的进步。下列哪一个发现更直接推动了人类进入电气化时代？

“六十年像长河，有缓流也有急流；六十年像画卷。有暖色也有冷色；六十年像乐曲，有高音也有低音。”在新中国的六十年里，具有战略转折性意义的事件是（    ）